﻿//定义画布宽高和生成点的个数
var WIDTH = window.innerWidth, HEIGHT = window.innerHeight, POINT = 35;

var canvas = document.getElementById('bgcanvas');
canvas.width = WIDTH,
canvas.height = HEIGHT;
var context = canvas.getContext('2d');
context.strokeStyle = 'rgba(0,0,0,0.02)',
context.strokeWidth = 1,
context.fillStyle = 'rgba(0,0,0,0.05)';
var circleArr = [];

//线条：开始xy坐标，结束xy坐标，线条透明度
function Line(x, y, _x, _y, o) {
    this.beginX = x,
    this.beginY = y,
    this.closeX = _x,
    this.closeY = _y,
    this.o = o;
}
//点：圆心xy坐标，半径，每帧移动xy的距离
function Circle(x, y, r, moveX, moveY) {
    this.x = x,
    this.y = y,
    this.r = r,
    this.moveX = moveX,
    this.moveY = moveY;
}
//生成max和min之间的随机数
function num(max, _min) {
    var min = arguments[1] || 0;
    return Math.floor(Math.random() * (max - min + 1) + min);
}
// 绘制原点
function drawCricle(cxt, x, y, r, moveX, moveY) {
    var circle = new Circle(x, y, r, moveX, moveY);
    cxt.beginPath();
    cxt.arc(circle.x, circle.y, circle.r, 0, 2 * Math.PI);
    cxt.closePath();
    cxt.fill();
    return circle;
}
//绘制线条
function drawLine(cxt, x, y, _x, _y, o) {
    var line = new Line(x, y, _x, _y, o);
    cxt.beginPath();
    cxt.strokeStyle = 'rgba(0,0,0,' + o + ')';
    cxt.moveTo(line.beginX, line.beginY);
    cxt.lineTo(line.closeX, line.closeY);
    cxt.closePath();
    cxt.stroke();

}
//初始化生成原点
function init() {
    circleArr = [];
    for (var i = 0; i < POINT; i++) {
        circleArr.push(drawCricle(context, num(WIDTH), num(HEIGHT), num(15, 2), num(10, -10) / 40, num(10, -10) / 40));
    }
    draw();
}

//每帧绘制
function draw() {
    context.clearRect(0, 0, canvas.width, canvas.height);
    for (var i = 0; i < POINT; i++) {
        drawCricle(context, circleArr[i].x, circleArr[i].y, circleArr[i].r);
    }
    for (var i = 0; i < POINT; i++) {
        for (var j = 0; j < POINT; j++) {
            if (i + j < POINT) {
                var A = Math.abs(circleArr[i + j].x - circleArr[i].x),
                    B = Math.abs(circleArr[i + j].y - circleArr[i].y);
                var lineLength = Math.sqrt(A * A + B * B);
                var C = 1 / lineLength * 7 - 0.009;
                var lineOpacity = C > 0.03 ? 0.03 : C;
                if (lineOpacity > 0) {
                    drawLine(context, circleArr[i].x, circleArr[i].y, circleArr[i + j].x, circleArr[i + j].y, lineOpacity);
                }
            }
        }
    }
}

//验证码刷新
function refresh() {
    $("#vcode").val("");
    $("#imgVerify").attr("src", "/Content/ValidateCode.ashx?" + Math.random());
}

$(document).keyup(function (e) {
    if (e.keyCode == 13) {
        Login();
    }
});


//调用执行
window.onload = function () {
    init();
    setInterval(function () {
        for (var i = 0; i < POINT; i++) {
            var cir = circleArr[i];
            cir.x += cir.moveX;
            cir.y += cir.moveY;
            if (cir.x > WIDTH) cir.x = 0;
            else if (cir.x < 0) cir.x = WIDTH;
            if (cir.y > HEIGHT) cir.y = 0;
            else if (cir.y < 0) cir.y = HEIGHT;

        }
        draw();
    }, 16);
    $('#btnLogin').click(function () {
        Login();
    });
}
//登录
function Login() {
    if ($('form').parsley().validate()) {
        var username = $("#username").val();
        var pwd = $("#password").val();
        var vcode = $("#vcode").val();
        var data = "{ username : \"" + username + "\",pwd:\"" + pwd + "\",vcode:\"" + vcode + "\"" + "}";
        $.ajax({
            type: "post",
            contentType: "application/json;utf-8",
            dataType: "text",
            url: "/Home/LogOn",
            data: data,
            success: function (result) {
                if (result == "success") {
                    window.location.href = "/Home/Index";
                }
                else {
                    var re = null, el = null;
                    if (result == "vcode") { re = "验证码有误！"; el = "#vcode"; }
                    else if (result == "acc") { re = "账号不存在！"; el = "#username"; }
                    else if (result == "pwd") { re = "密码有误！"; el = "#password"; }
                    else if (result == "enable") { re = "该账号已禁用！"; $("#username,#password,#vcode").val(''); el = "#username"; }
                    var tips = '登录以继续.';
                    var appStr = '<span style="color:red;">' + re + '</span>';
                    if (re != null) {
                        $('.panel-body p').html(appStr);
                        setTimeout(function () {
                            $('.panel-body p').html(tips);
                        }, 4000);
                        $(el).val('');
                        $(el).focus();
                    } else {
                        alert(result);
                    }
                    refresh();
                }
            },
            error: function (statusText, responseText) {
                alert("服务器连接有误！" + responseText);
            }
        });
    }
}